When faced with similar issues of absurdly friable plaster, I resorted to massive over-engineering with hammer fixings as long as they had to be to get a decent grip in to the bricks behind.
If there's a deep hole to fill, you want to make sure the filler has dried properly before you drill in to it. This may mean multiple layers and lots of waiting. You can get special 'deep hole' filler that dries a bit quicker (and is easier to apply) for this sort of thing.
Another handy thing is reinforcing tape - I forget the name, but it's a bit like white gaffer tape with thicker strings. I think it's meant for repairing plasterboard. You take the surface back to stable and apply the tape over the hole. Then skim coat with plaster.
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timeasmymeasure
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Date: 2015-10-30 08:36 am (UTC)If there's a deep hole to fill, you want to make sure the filler has dried properly before you drill in to it. This may mean multiple layers and lots of waiting. You can get special 'deep hole' filler that dries a bit quicker (and is easier to apply) for this sort of thing.
Another handy thing is reinforcing tape - I forget the name, but it's a bit like white gaffer tape with thicker strings. I think it's meant for repairing plasterboard. You take the surface back to stable and apply the tape over the hole. Then skim coat with plaster.